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2022 ◽  
Vol 46 ◽  
pp. 103809
Yi Xie ◽  
Huihui Li ◽  
Wei Li ◽  
Yangjun Zhang ◽  
Michael Fowler ◽  

Electronics ◽  
2022 ◽  
Vol 11 (2) ◽  
pp. 248
Gennady Mesyats ◽  
Vladislav Rostov ◽  
Konstantin Sharypov ◽  
Valery Shpak ◽  
Sergey Shunailov ◽  

The structure of the emission surface of a cold tubular cathode and electron beam was investigated as a function of the magnetic field in the coaxial diode of the high-current accelerator. The runaway mode of magnetized electrons in atmospheric air enabled registering the instantaneous structure of activated field-emission centers at the cathode edge. The region of air pressure (about 3 Torr) was determined experimentally and via analysis, where the explosive emission mechanism of the appearance of fast electrons with energies above 100 keV is replaced by the runaway electrons in a gas.

2022 ◽  
pp. 599-601
Mikhail K. Kovalev ◽  
Hangjuan Ren ◽  
Marsha Zakir Muhamad ◽  
Joel W. Ager ◽  
Alexei A. Lapkin

2022 ◽  
Vol 13 (1) ◽  
Zhenhua Li ◽  
Yifan Yan ◽  
Si-Min Xu ◽  
Hua Zhou ◽  
Ming Xu ◽  

AbstractElectrochemical alcohols oxidation offers a promising approach to produce valuable chemicals and facilitate coupled H2 production. However, the corresponding current density is very low at moderate cell potential that substantially limits the overall productivity. Here we report the electrooxidation of benzyl alcohol coupled with H2 production at high current density (540 mA cm−2 at 1.5 V vs. RHE) over a cooperative catalyst of Au nanoparticles supported on cobalt oxyhydroxide nanosheets (Au/CoOOH). The absolute current can further reach 4.8 A at 2.0 V in a more realistic two-electrode membrane-free flow electrolyzer. Experimental combined with theoretical results indicate that the benzyl alcohol can be enriched at Au/CoOOH interface and oxidized by the electrophilic oxygen species (OH*) generated on CoOOH, leading to higher activity than pure Au. Based on the finding that the catalyst can be reversibly oxidized/reduced at anodic potential/open circuit, we design an intermittent potential (IP) strategy for long-term alcohol electrooxidation that achieves high current density (>250 mA cm−2) over 24 h with promoted productivity and decreased energy consumption.

Coatings ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 61
Liang Hu ◽  
Bo Gao ◽  
Ning Xu ◽  
Yue Sun ◽  
Ying Zhang ◽  

The effect of Ce and Mg on surface microcracks of Al–20Si alloys induced via high-current pulsed electron beam (HCPEB) was studied. Mg was revealed to refine the primary Si phase in the pristine microstructure by forming a Mg2Si phase, leading to the suppression of microcrack propagation within the brittle phase after HCPEB irradiation. The incorporation of Ce into the Al–Si–Mg alloys further refined the primary Si phase and reduced the local stress concentration in the brittle phase induced by HCPEB irradiation. Ultimately, the surface microcracks were observed to be eliminated by the synergistic effects between the two elements. For Al–20Si–5Mg–0.7Ce alloys, Ce demonstrated a homogeneous distribution in the Al matrix on the HCPEB-irradiated alloy surface, while the Mg and Si exhibited a certain degree of aggregation in the Mg2Si phase. Metastable structures were formed on the HCPEB-irradiated alloy surface, including the nano-primary silicon phase, nano-cellular aluminium structure, and nano-Mg2Si phase. Compared with alloy specimens containing Mg, the Al–20Si–5Mg–0.7Ce alloy specimens exhibited an excellent anticorrosion property after HCPEB irradiation mainly due to the combined effects of the grain refinement and microcrack elimination.

Alexander C. Pakpour-Tabrizi ◽  
Shari Yosinski ◽  
Ralph Jennings-Moors ◽  
Zachary A. Kobos ◽  
Sonya D. Sawtelle ◽  

Chuanyong Jian ◽  
Qian Cai ◽  
Wenting Hong ◽  
Wei Liu

Herein, we report the large-scale production of a molybdenum oxide-phosphide (MoO2-MoP) seamless electrode (SE) that is vertically grown on cheap industrial-grade molybdenum substrates (e.g. molybdenum plate, molybdenum mesh, or molybdenum...

2022 ◽  
Vol 174 ◽  
pp. 112973
Zheng Xue ◽  
Wei-bin Li ◽  
Wei-min Xuan ◽  
Jun-hong Chen

Zhiming Yu ◽  
Xinpei Duan ◽  
Sen Zhang ◽  
Jun Lin ◽  
Wanhan Su ◽  

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